chpasswd: new applet by Alexander Shishkin <virtuoso@slind.org>

11 files changed, 97 insertions, 169 deletions

diff --git a/include/applets.h b/include/applets.h
index 90af4f4..a05f74a 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -89,6 +89,7 @@ USE_CHCON(APPLET(chcon, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_CHGRP(APPLET_NOEXEC(chgrp, chgrp, _BB_DIR_BIN, _BB_SUID_NEVER, chgrp))
 USE_CHMOD(APPLET_NOEXEC(chmod, chmod, _BB_DIR_BIN, _BB_SUID_NEVER, chmod))
 USE_CHOWN(APPLET_NOEXEC(chown, chown, _BB_DIR_BIN, _BB_SUID_NEVER, chown))
+USE_CHPASSWD(APPLET(chpasswd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_CHPST(APPLET(chpst, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_CHROOT(APPLET(chroot, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_CHRT(APPLET(chrt, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
diff --git a/include/libbb.h b/include/libbb.h
index 46860c6..a8b9b5b 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -769,6 +769,7 @@ extern void selinux_or_die(void);
 extern int restricted_shell(const char *shell);
 extern void setup_environment(const char *shell, int loginshell, int changeenv, const struct passwd *pw);
 extern int correct_password(const struct passwd *pw);
+/* Returns a ptr to static storage */
 extern char *pw_encrypt(const char *clear, const char *salt);
 extern int obscure(const char *old, const char *newval, const struct passwd *pwdp);
 extern int index_in_str_array(const char * const string_array[], const char *key);
@@ -776,7 +777,18 @@ extern int index_in_substr_array(const char * const string_array[], const char *
 extern void print_login_issue(const char *issue_file, const char *tty);
 extern void print_login_prompt(void);
 
-extern void crypt_make_salt(char *p, int cnt);
+/* rnd is additional random input. New one is returned.
+ * Useful if you call crypt_make_salt many times in a row:
+ * rnd = crypt_make_salt(buf1, 4, 0);
+ * rnd = crypt_make_salt(buf2, 4, rnd);
+ * rnd = crypt_make_salt(buf3, 4, rnd);
+ * (otherwise we risk having same salt generated)
+ */
+extern int crypt_make_salt(char *p, int cnt, int rnd);
+
+/* Returns number of lines changed, or -1 on error */
+extern int update_passwd(const char *filename, const char *username,
+			const char *new_pw);
 
 int get_terminal_width_height(const int fd, int *width, int *height);
 
diff --git a/include/usage.h b/include/usage.h
index 29a4991..9c77c70 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -452,7 +452,7 @@
        "	F	Input from file"
 
 #define crond_trivial_usage \
-       "-d[#] -c <crondir> -f -b"
+       "-d[#] -c crondir -f -b"
 #define crond_full_usage \
        "	-d [#] -l [#] -S -L logfile -f -b -c dir\n" \
        "	-d num	Debug level\n" \
@@ -466,8 +466,8 @@
 #define crontab_trivial_usage \
        "[-c dir] {file|-}|[-u|-l|-e|-d user]"
 #define crontab_full_usage \
-       "	file <opts>	Replace crontab from file\n" \
-       "	- <opts>	Replace crontab from stdin\n" \
+       "	file [opts]	Replace crontab from file\n" \
+       "	- [opts]	Replace crontab from stdin\n" \
        "	-u user		Specify user\n" \
        "	-l [user]	List crontab for user\n" \
        "	-e [user]	Edit crontab for user\n" \
@@ -1216,7 +1216,7 @@
        "-rw-rw-r--    1 andersen andersen   554058 Apr 14 17:49 /tmp/busybox.tar.gz\n"
 
 #define halt_trivial_usage \
-       "[-d<delay>] [-n<nosync>] [-f<force>]"
+       "[-d delay] [-n] [-f]"
 #define halt_full_usage \
        "Halt the system" \
        "\n\nOptions:\n" \
@@ -1332,14 +1332,14 @@
        "sage\n"
 
 #define httpd_trivial_usage \
-       "[-c <conf file>]" \
-       " [-p <port>]" \
+       "[-c conffile]" \
+       " [-p port]" \
        " [-i] [-f]" \
 	USE_FEATURE_HTTPD_SETUID(" [-u user[:grp]]") \
-	USE_FEATURE_HTTPD_BASIC_AUTH(" [-r <realm>]") \
+	USE_FEATURE_HTTPD_BASIC_AUTH(" [-r realm]") \
 	USE_FEATURE_HTTPD_AUTH_MD5(" [-m pass]") \
        " [-h home]" \
-       " [-d/-e <string>]"
+       " [-d/-e string]"
 #define httpd_full_usage \
        "Listen for incoming http server requests" \
        "\n\nOptions:\n" \
@@ -1388,27 +1388,27 @@
        "uid=1000(andersen) gid=1000(andersen)\n"
 
 #define ifconfig_trivial_usage \
-	USE_FEATURE_IFCONFIG_STATUS("[-a]") " <interface> [<address>]"
+	USE_FEATURE_IFCONFIG_STATUS("[-a]") " interface [address]"
 #define ifconfig_full_usage \
        "Configure a network interface" \
        "\n\nOptions:\n" \
 	USE_FEATURE_IPV6( \
-       "	[add <address>[/<prefixlen>]]\n") \
+       "	[add ADDRESS[/PREFIXLEN]]\n") \
 	USE_FEATURE_IPV6( \
-       "	[del <address>[/<prefixlen>]]\n") \
-       "	[[-]broadcast [<address>]] [[-]pointopoint [<address>]]\n" \
-       "	[netmask <address>] [dstaddr <address>]\n" \
+       "	[del ADDRESS[/PREFIXLEN]]\n") \
+       "	[[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]]\n" \
+       "	[netmask ADDRESS] [dstaddr ADDRESS]\n" \
 	USE_FEATURE_IFCONFIG_SLIP( \
-       "	[outfill <NN>] [keepalive <NN>]\n") \
-       "	" USE_FEATURE_IFCONFIG_HW("[hw ether <address>] ") "[metric <NN>] [mtu <NN>]\n" \
+       "	[outfill NN] [keepalive NN]\n") \
+       "	" USE_FEATURE_IFCONFIG_HW("[hw ether ADDRESS] ") "[metric NN] [mtu NN]\n" \
        "	[[-]trailers] [[-]arp] [[-]allmulti]\n" \
-       "	[multicast] [[-]promisc] [txqueuelen <NN>] [[-]dynamic]\n" \
+       "	[multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic]\n" \
 	USE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ( \
-       "	[mem_start <NN>] [io_addr <NN>] [irq <NN>]\n") \
+       "	[mem_start NN] [io_addr NN] [irq NN]\n") \
        "	[up|down] ..."
 
 #define ifup_trivial_usage \
-       "<-ahinv> <ifaces...>"
+       "[-ahinv] ifaces..."
 #define ifup_full_usage \
        "Options:\n" \
        "	-a	De/configure all interfaces automatically\n" \
@@ -1420,7 +1420,7 @@
        "	-f	Force de/configuration"
 
 #define ifdown_trivial_usage \
-       "<-ahinv> <ifaces...>"
+       "[-ahinv] ifaces..."
 #define ifdown_full_usage \
        "Options:\n" \
        "	-a	De/configure all interfaces automatically\n" \
@@ -1587,7 +1587,7 @@
        "	-x	Do not export externs"
 
 #define install_trivial_usage \
-       "[-cgmops] [sources] <dest|directory>"
+       "[-cgmops] [sources] dest|directory"
 #define install_full_usage \
        "Copy files and set attributes" \
        "\n\nOptions:\n" \
@@ -1634,7 +1634,7 @@
        "	SCOPE-ID := [host | link | global | NUMBER]"
 
 #define ipcalc_trivial_usage \
-       "[OPTION]... <ADDRESS>[[/]<NETMASK>] [NETMASK]"
+       "[OPTION]... ADDRESS[[/]NETMASK] [NETMASK]"
 #define ipcalc_full_usage \
        "Calculate IP network settings from a IP address" \
        "\n\nOptions:" \
@@ -1778,7 +1778,7 @@
        "		reached"
 
 #define setarch_trivial_usage \
-       "<personality> <program> [args ...]"
+       "personality program [args ...]"
 #define setarch_full_usage \
        "Personality may be:\n" \
        "	linux32		Set 32bit uname emulation\n" \
@@ -2502,7 +2502,7 @@
        "to standard output. With no FILE, or when FILE is -, read standard input."
 
 #define openvt_trivial_usage \
-       "<vtnum> <COMMAND> [ARGS...]"
+       "VTNUM COMMAND [ARGS...]"
 #define openvt_full_usage \
        "Start a command on a new virtual terminal"
 #define openvt_example_usage \
@@ -2520,8 +2520,17 @@
        "	-l	Locks (disables) the specified user account\n" \
        "	-u	Unlocks (re-enables) the specified user account"
 
+#define chpasswd_trivial_usage \
+       "[--md5|--encrypt]"
+#define chpasswd_full_usage \
+       "Read user:password information from stdin\n" \
+       "and update /etc/passwd accordingly." \
+       "\n\nOptions:" \
+       "\n	-e, --encrypt	Supplied passwords are in encrypted form" \
+       "\n	-m, --md5	Use MD5 encryption instead of DES"
+
 #define patch_trivial_usage \
-       "[-p<num>] [-i <diff>]"
+       "[-p num] [-i diff]"
 #define patch_full_usage \
        "	-p NUM	Strip NUM leading components from file names\n" \
        "	-i DIFF	Read DIFF instead of stdin"
@@ -2612,7 +2621,7 @@
        "the new root file system"
 
 #define poweroff_trivial_usage \
-       "[-d<delay>] [-n<nosync>] [-f<force>]"
+       "[-d delay] [-n] [-f]"
 #define poweroff_full_usage \
        "Halt and shut off power" \
        "\n\nOptions:\n" \
@@ -2729,9 +2738,9 @@
        "[OPTIONS]..."
 #define readprofile_full_usage \
        "Options:\n" \
-       "	-m <mapfile>	(Default: /boot/System.map)\n" \
-       "	-p <profile>	(Default: /proc/profile)\n" \
-       "	-M <mult>	Set the profiling multiplier to <mult>\n" \
+       "	-m mapfile	(Default: /boot/System.map)\n" \
+       "	-p profile	(Default: /proc/profile)\n" \
+       "	-M mult		Set the profiling multiplier to mult\n" \
        "	-i		Print only info about the sampling step\n" \
        "	-v		Verbose\n" \
        "	-a		Print all symbols, even if count is 0\n" \
@@ -2746,7 +2755,7 @@
        "Return the absolute pathnames of given argument"
 
 #define reboot_trivial_usage \
-       "[-d<delay>] [-n<nosync>] [-f<force>]"
+       "[-d delay] [-n] [-f]"
 #define reboot_full_usage \
        "Reboot the system" \
        "\n\nOptions:\n" \
@@ -3083,21 +3092,21 @@ USE_FEATURE_RUN_PARTS_FANCY("\n	-l	Prints names of all matching files even when
        "\n\nOptions:" \
        "\n	-S|--start			Start" \
        "\n	-K|--stop			Stop" \
-       "\n	-a|--startas <pathname>		Starts process specified by pathname" \
+       "\n	-a|--startas pathname		Starts process specified by pathname" \
        "\n	-b|--background			Force process into background" \
-       "\n	-u|--user <username>|<uid>	Stop this user's processes" \
-       "\n	-x|--exec <executable>		Program to either start or check" \
+       "\n	-u|--user username|uid		Stop this user's processes" \
+       "\n	-x|--exec executable		Program to either start or check" \
        "\n	-m|--make-pidfile		Create the -p file and enter pid in it" \
-       "\n	-n|--name <process-name>	Stop processes with this name" \
-       "\n	-p|--pidfile <pid-file>		Save or load pid using a pid-file" \
+       "\n	-n|--name process-name		Stop processes with this name" \
+       "\n	-p|--pidfile pid-file		Save or load pid using a pid-file" \
        "\n	-q|--quiet			Quiet" \
 	USE_FEATURE_START_STOP_DAEMON_FANCY( \
        "\n	-o|--oknodo			Exit status 0 if nothing done" \
        "\n	-v|--verbose			Verbose" \
-       "\n	-N|--nicelevel <N>		Add N to process's nice level" \
+       "\n	-N|--nicelevel N		Add N to process's nice level" \
 	) \
-       "\n	-s|--signal <signal>		Signal to send (default TERM)" \
-       "\n	-c|--chuid <user>[:[<group>]]	Change to specified user/group"
+       "\n	-s|--signal signal		Signal to send (default TERM)" \
+       "\n	-c|--chuid user[:[group]]	Change to specified user/group"
 
 #define stat_trivial_usage \
        "[OPTION] FILE..."
@@ -3257,7 +3266,7 @@ USE_FEATURE_RUN_PARTS_FANCY("\n	-l	Prints names of all matching files even when
        "sysctl [-n] variable ...\n" \
        "sysctl [-n] -w variable=value ...\n" \
        "sysctl [-n] -a\n" \
-       "sysctl [-n] -p <file>	(default /etc/sysctl.conf)\n" \
+       "sysctl [-n] -p file	(default /etc/sysctl.conf)\n" \
        "sysctl [-n] -A\n"
 
 #define syslogd_trivial_usage \
@@ -3747,7 +3756,7 @@ USE_FEATURE_RUN_PARTS_FANCY("\n	-l	Prints names of all matching files even when
        "	-a	Lock all VTs"
 
 #define watch_trivial_usage \
-       "[-n <seconds>] [-t] COMMAND..."
+       "[-n seconds] [-t] COMMAND..."
 #define watch_full_usage \
        "Execute a program periodically" \
        "\n\nOptions:\n" \
@@ -3760,7 +3769,7 @@ USE_FEATURE_RUN_PARTS_FANCY("\n	-l	Prints names of all matching files even when
        "Mon Dec 17 10:31:44 GMT 2000"
 
 #define watchdog_trivial_usage \
-       "[-t <seconds>] [-F] DEV"
+       "[-t seconds] [-F] DEV"
 #define watchdog_full_usage \
        "Periodically write to watchdog device DEV" \
        "\n\nOptions:\n" \
diff --git a/libbb/Kbuild b/libbb/Kbuild
index 6595867..c0cbe1a 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -104,7 +104,8 @@ lib-y += xreadlink.o
 lib-$(CONFIG_FEATURE_MOUNT_LOOP) += loop.o
 lib-$(CONFIG_LOSETUP) += loop.o
 lib-$(CONFIG_FEATURE_MTAB_SUPPORT) += mtab.o
-lib-$(CONFIG_PASSWD) += pw_encrypt.o crypt_make_salt.o
+lib-$(CONFIG_PASSWD) += pw_encrypt.o crypt_make_salt.o update_passwd.o
+lib-$(CONFIG_CHPASSWD) += pw_encrypt.o crypt_make_salt.o update_passwd.o
 lib-$(CONFIG_CRYPTPW) += pw_encrypt.o crypt_make_salt.o
 lib-$(CONFIG_SULOGIN) += pw_encrypt.o
 lib-$(CONFIG_FEATURE_HTTPD_AUTH_MD5) += pw_encrypt.o
diff --git a/libbb/crypt_make_salt.c b/libbb/crypt_make_salt.c
index 12e9632..ebdf024 100644
--- a/libbb/crypt_make_salt.c
+++ b/libbb/crypt_make_salt.c
@@ -24,12 +24,9 @@ static int i64c(int i)
 	return ('a' - 38 + i);
 }
 
-
-void crypt_make_salt(char *p, int cnt)
+int crypt_make_salt(char *p, int cnt, int x)
 {
-	unsigned x = x; /* it's pointless to initialize it anyway :) */
-
-	x += getpid() + time(NULL) + clock();
+	x += getpid() + time(NULL);
 	do {
 		/* x = (x*1664525 + 1013904223) % 2^32 generator is lame
 		 * (low-order bit is not "random", etc...),
@@ -44,5 +41,5 @@ void crypt_make_salt(char *p, int cnt)
 		*p++ = i64c(x >> 22);
 	} while (--cnt);
 	*p = '\0';
+	return x;
 }
-
diff --git a/loginutils/Config.in b/loginutils/Config.in
index f9ae122..63ae9b4 100644
--- a/loginutils/Config.in
+++ b/loginutils/Config.in
@@ -180,6 +180,14 @@ config CRYPTPW
 	help
 	  Applet for crypting a string.
 
+config CHPASSWD
+       bool "chpasswd"
+       default n
+       help
+         chpasswd  reads  a  file  of user name and password pairs from
+         standard input and uses this information to update a group of
+         existing users.
+
 config SU
 	bool "su"
 	default n
diff --git a/loginutils/Kbuild b/loginutils/Kbuild
index 1b1165a..3d0d777 100644
--- a/loginutils/Kbuild
+++ b/loginutils/Kbuild
@@ -8,6 +8,7 @@ lib-y:=
 lib-$(CONFIG_ADDGROUP)	+= addgroup.o
 lib-$(CONFIG_ADDUSER)	+= adduser.o
 lib-$(CONFIG_CRYPTPW)	+= cryptpw.o
+lib-$(CONFIG_CHPASSWD)	+= chpasswd.o
 lib-$(CONFIG_GETTY)	+= getty.o
 lib-$(CONFIG_LOGIN)	+= login.o
 lib-$(CONFIG_PASSWD)	+= passwd.o
diff --git a/loginutils/cryptpw.c b/loginutils/cryptpw.c
index dd73046..1c30591 100644
--- a/loginutils/cryptpw.c
+++ b/loginutils/cryptpw.c
@@ -17,9 +17,9 @@ int cryptpw_main(int argc, char **argv)
 		/* Too ugly, and needs even more magic to handle endianness: */
 		//((uint32_t*)&salt)[0] = '$' + '1'*0x100 + '$'*0x10000;
 		/* Hope one day gcc will do it itself (inlining strcpy) */
-		crypt_make_salt(salt + 3, 4); /* md5 */
+		crypt_make_salt(salt + 3, 4, 0); /* md5 */
 	} else {
-		crypt_make_salt(salt, 1);     /* des */
+		crypt_make_salt(salt, 1, 0);     /* des */
 	}
 
 	puts(pw_encrypt(argv[optind] ? argv[optind] : xmalloc_getline(stdin), salt));
diff --git a/loginutils/passwd.c b/loginutils/passwd.c
index 8f65c3d..cd98d41 100644
--- a/loginutils/passwd.c
+++ b/loginutils/passwd.c
@@ -52,10 +52,10 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
 	}
 
 	/*memset(salt, 0, sizeof(salt)); - why?*/
-	crypt_make_salt(salt, 1); /* des */
+	crypt_make_salt(salt, 1, 0); /* des */
 	if (algo) { /* MD5 */
 		strcpy(salt, "$1$");
-		crypt_make_salt(salt + 3, 4);
+		crypt_make_salt(salt + 3, 4, 0);
 	}
 	ret = xstrdup(pw_encrypt(newp, salt)); /* returns ptr to static */
 	/* whee, success! */
@@ -70,115 +70,6 @@ static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
 	return ret;
 }
 
-
-static int update_passwd(const char *filename, const char *username,
-			const char *new_pw)
-{
-	struct stat sb;
-	struct flock lock;
-	FILE *old_fp;
-	FILE *new_fp;
-	char *new_name;
-	char *last_char;
-	unsigned user_len;
-	int old_fd;
-	int new_fd;
-	int i;
-	int ret = 1; /* failure */
-
-	logmode = LOGMODE_STDIO;
-	/* New passwd file, "/etc/passwd+" for now */
-	new_name = xasprintf("%s+", filename);
-	last_char = &new_name[strlen(new_name)-1];
-	username = xasprintf("%s:", username);
-	user_len = strlen(username);
-
-	old_fp = fopen(filename, "r+");
-	if (!old_fp)
-		goto free_mem;
-	old_fd = fileno(old_fp);
-
-	/* Try to create "/etc/passwd+". Wait if it exists. */
-	i = 30;
-	do {
-		// FIXME: on last iteration try w/o O_EXCL but with O_TRUNC?
-		new_fd = open(new_name, O_WRONLY|O_CREAT|O_EXCL,0600);
-		if (new_fd >= 0) goto created;
-		if (errno != EEXIST) break;
-		usleep(100000); /* 0.1 sec */
-	} while (--i);
-	bb_perror_msg("cannot create '%s'", new_name);
-	goto close_old_fp;
- created:
-	if (!fstat(old_fd, &sb)) {
-		fchmod(new_fd, sb.st_mode & 0777); /* ignore errors */
-		fchown(new_fd, sb.st_uid, sb.st_gid);
-	}
-	new_fp = fdopen(new_fd, "w");
-	if (!new_fp) {
-		close(new_fd);
-		goto unlink_new;
-	}
-
-	/* Backup file is "/etc/passwd-" */
-	last_char[0] = '-';
-	/* Delete old one, create new as a hardlink to current */
-	i = (unlink(new_name) && errno != ENOENT);
-	if (i || link(filename, new_name))
-		bb_perror_msg("warning: cannot create backup copy '%s'", new_name);
-	last_char[0] = '+';
-
-	/* Lock the password file before updating */
-	lock.l_type = F_WRLCK;
-	lock.l_whence = SEEK_SET;
-	lock.l_start = 0;
-	lock.l_len = 0;
-	if (fcntl(old_fd, F_SETLK, &lock) < 0)
-		bb_perror_msg("warning: cannot lock '%s'", filename);
-	lock.l_type = F_UNLCK;
-
-	/* Read current password file, write updated one */
-	while (1) {
-		char *line = xmalloc_fgets(old_fp);
-		if (!line) break; /* EOF/error */
-		if (strncmp(username, line, user_len) == 0) {
-			/* we have a match with "username:"... */
-			const char *cp = line + user_len;
-			/* now cp -> old passwd, skip it: */
-			cp = strchr(cp, ':');
-			if (!cp) cp = "";
-			/* now cp -> ':' after old passwd or -> "" */
-			fprintf(new_fp, "%s%s%s", username, new_pw, cp);
-			/* Erase password in memory */
-		} else
-			fputs(line, new_fp);
-		free(line);
-	}
-	fcntl(old_fd, F_SETLK, &lock);
-
-	/* We do want all of them to execute, thus | instead of || */
-	if ((ferror(old_fp) | fflush(new_fp) | fsync(new_fd) | fclose(new_fp))
-	 || rename(new_name, filename)
-	) {
-		/* At least one of those failed */
-		goto unlink_new;
-	}
-	ret = 0; /* whee, success! */
-
- unlink_new:
-	if (ret) unlink(new_name);
-
- close_old_fp:
-	fclose(old_fp);
-
- free_mem:
-	if (ENABLE_FEATURE_CLEAN_UP) free(new_name);
-	if (ENABLE_FEATURE_CLEAN_UP) free((char*)username);
-	logmode = LOGMODE_BOTH;
-	return ret;
-}
-
-
 int passwd_main(int argc, char **argv);
 int passwd_main(int argc, char **argv)
 {
@@ -192,6 +83,7 @@ int passwd_main(int argc, char **argv)
 		/*STATE_ALGO_des = 0x20, not needed yet */
 	};
 	unsigned opt;
+	int rc;
 	const char *opt_a = "";
 	const char *filename;
 	char *myname;
@@ -278,12 +170,11 @@ int passwd_main(int argc, char **argv)
 	signal(SIGQUIT, SIG_IGN);
 	umask(077);
 	xsetuid(0);
-	if (update_passwd(filename, name, newp) != 0) {
-		/* LOGMODE_BOTH */
+	rc = update_passwd(filename, name, newp);
+	logmode = LOGMODE_BOTH;
+	if (rc < 0)
 		bb_error_msg_and_die("cannot update password file %s",
 				filename);
-	}
-	/* LOGMODE_BOTH */
 	bb_info_msg("Password for %s changed by %s", name, myname);
 
 	if (ENABLE_FEATURE_CLEAN_UP) free(newp);
diff --git a/scripts/defconfig b/scripts/defconfig
index 088ff79..4709b22 100644
--- a/scripts/defconfig
+++ b/scripts/defconfig
@@ -376,6 +376,7 @@ CONFIG_FEATURE_SECURETTY=y
 CONFIG_PASSWD=y
 CONFIG_FEATURE_PASSWD_WEAK_CHECK=y
 CONFIG_CRYPTPW=y
+CONFIG_CHPASSWD=y
 CONFIG_SU=y
 CONFIG_FEATURE_SU_SYSLOG=y
 CONFIG_FEATURE_SU_CHECKS_SHELLS=y
diff --git a/scripts/trylink b/scripts/trylink
index ddd7fb1..cbd7023 100755
--- a/scripts/trylink
+++ b/scripts/trylink
@@ -22,9 +22,11 @@ try "-Wl,--start-group $l_list -Wl,--end-group" "$@" \
     cat busybox_ld.err
     exit 1
 }
+mv busybox_unstripped busybox_unstripped.tmp
 
 # Now try to remove each lib and build without.
 # Stop when no lib can be removed.
+ever_discarded=false
 while test "$BBOX_LIB_LIST"; do
     $debug && echo "Trying libraries: $BBOX_LIB_LIST"
     all_needed=true
@@ -36,6 +38,7 @@ while test "$BBOX_LIB_LIST"; do
 		echo "Library $one is not needed"
 		BBOX_LIB_LIST="$without_one"
 		all_needed=false
+		ever_discarded=true
 	else
 		echo "Library $one is needed"
 	fi
@@ -48,7 +51,11 @@ while test "$BBOX_LIB_LIST"; do
     #echo "$BBOX_LIB_LIST" | grep -q ' ' || break
 done
 
-# Ok, make the binary
-echo "Final link with: $BBOX_LIB_LIST"
-l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/'`
-try "-Wl,--start-group $l_list -Wl,--end-group" "$@"
+mv busybox_unstripped.tmp busybox_unstripped
+$ever_discarded && {
+    # Ok, make the binary
+    echo "Final link with: $BBOX_LIB_LIST"
+    l_list=`echo "$BBOX_LIB_LIST" | sed -e 's/ / -l/g' -e 's/^/-l/'`
+    try "-Wl,--start-group $l_list -Wl,--end-group" "$@"
+}
+exit 0  # Ensure "success" exit code